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Physconia perisidiosa (Erichsen) Moberg


Foliose, thallus presumably green when wet, drying grey or grey-brown with tinges of mauve, lobes small, expanded towards the tips, with marginal and terminal lip-like soralia and isidiate towards the centre of the thallus, upper surface pruinose, undersides ecorticate at the tips, rhizines black, bottle-brush-like, medulla white; apothecia rare. Widespread but local on nutrient-rich bark, rarely on walls.

Refs: Smith et al. (2009), 705; Purvis et al. (1992), 472; Dobson (2005), 344; Dobson (2011), 345 (photo); Nordic Lichen Flora (2002) 2: 41, 100 (photo); van Haluwyn et al. (2009), 92-3 (photo); van Herk & Aptroot (2004, 2013), 306-7 (photo); Valcárcel et al. (2003), 312-13 (photo); Wirth (1995), 2: 729, 740 (photo); Wirth et al. (2004), 124 (photo); Wirth, Hauck & Schulz (2013), 2: 874, 884 (photo); Frahm et al. (2010), 142 (photo); Moberg & Holmåson (1984), 203 (photo); Holien & Tønsberg (2008), 80 (photo); Stenroos et al. (2011), 365 (photo); Brodo et al. (2001), 565-6 (photo); Hinds & Hinds (2007), 405; McCune & Geiser (2009), 277 (photo); Lichen Atlas of the British Isles 3: 1129 (1998).

 
Physconia perisidiosa
Physconia perisidiosa
On Ash (Fraxinus excelsior), Gleniffer Braes (Brownside Braes), Renfrewshire, May 2009


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© A.J. Silverside
Uploaded July 2008, revised with replacement photographs June 2009, last updated December 2013